<template>
  <div class="app" style="border: 1px solid red">
    <h2>Vue3 App</h2>
    <div>{{ count }}</div>
    <button @click="addCounter">+1</button>
  </div>
</template>

<script setup>
import { ref } from "vue";
const count = ref(100);
function addCounter() {
  count.value++;
}
</script>
